/**
 * Equivalence.java
 * 
 * Copyright (C) 2012 - Thibault BUREL
 * 
 * This file is part of MathDraft.
 *
 * MathDraft is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * MathDraft is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with MathDraft.  If not, see <http://www.gnu.org/licenses/>
 *  
 */
package drk.mathdraft.proposition;


public class Equivalence extends BinaryOperation
{	
	/*************************************************************************
	 *                          M E T H O D S                                *
	 *************************************************************************/	
	public Equivalence (Proposition l, Proposition r)
	{
		super("\\Leftrightarrow", 0, l, r);
	}
	
	public Equivalence(Equivalence e)
	{
		super(e);
	}
	
	public Proposition copy()
	{
		return new Equivalence(this);
	}
	
	public boolean equals(Proposition p)
	{
		if(p instanceof Equivalence)
		{
			if(this.getFirst().equals(((Equivalence)p).getFirst()) &&
			   this.getSecond().equals(((Equivalence)p).getSecond()))
			{
				return true;
			}
			
			if(this.getFirst().equals(((Equivalence)p).getSecond()) &&
			   this.getSecond().equals(((Equivalence)p).getFirst()))
			{
				return true;
			}
		}
		return false;
	}
	
	public String getIconCommand()
	{
		return "\\Leftrightarrow";
	}
}